A summary view of your matches can be accessed without a MyHeritage account. However, viewing a full record or confirming or rejecting a record will require a MyHeritage account.
A MyHeritage account is required to purchase a Data subscription. Some collections, such as Find-A-Grave, are available for free, and you can view a summary view of all matches for free. Viewing some matches, and confirming matches, requires a Data subscription.